/*
 * Copyright (C) 2005-2011 MaNGOS <http://www.getmangos.com/>
 *
 * Copyright (C) 2008-2011 Trinity <http://www.trinitycore.org/>
 *
 * Copyright (C) 2010-2011 ProjectSkyfire <http://www.projectskyfire.org/>
 * 
 * Copyright (C) 2011 ArkCORE <http://www.arkania.net/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef ARKCORECORE_PATH_H
#define ARKCORECORE_PATH_H

#include "Common.h"
#include <vector>

struct SimplePathNode {
	float x, y, z;
};
template<typename PathElem, typename PathNode = PathElem>

class Path {
public:
	size_t size() const {
		return i_nodes.size();
	}
	bool empty() const {
		return i_nodes.empty();
	}
	void resize(unsigned int sz) {
		i_nodes.resize(sz);
	}
	void clear() {
		i_nodes.clear();
	}
	void erase(uint32 idx) {
		i_nodes.erase(i_nodes.begin() + idx);
	}

	float GetTotalLength(uint32 start, uint32 end) const {
		float len = 0.0f;
		for (uint32 idx = start + 1; idx < end; ++idx) {
			PathNode const& node = i_nodes[idx];
			PathNode const& prev = i_nodes[idx - 1];
			float xd = node.x - prev.x;
			float yd = node.y - prev.y;
			float zd = node.z - prev.z;
			len += sqrtf(xd * xd + yd * yd + zd * zd);
		}
		return len;
	}

	float GetTotalLength() const {
		return GetTotalLength(0, size());
	}

	float GetPassedLength(uint32 curnode, float x, float y, float z) {
		float len = GetTotalLength(0, curnode);

		if (curnode > 0) {
			PathNode const& node = i_nodes[curnode - 1];
			float xd = x - node.x;
			float yd = y - node.y;
			float zd = z - node.z;
			len += sqrtf(xd * xd + yd * yd + zd * zd);
		}

		return len;
	}

	PathNode& operator[](size_t idx) {
		return i_nodes[idx];
	}
	PathNode const& operator[](size_t idx) const {
		return i_nodes[idx];
	}

	void set(size_t idx, PathElem elem) {
		i_nodes[idx] = elem;
	}

protected:
	std::vector<PathElem> i_nodes;
};

typedef Path<SimplePathNode> SimplePath;

#endif
